634 RODENTIA. 



Eth., 1 sp. Deomys, Eth., 1 sp. Dendromys, Eth., 6 sp. Limacomya, 

 Eth., 1 sp. Steatomys, Eth., 4 sp. Malacothrix, Eth., 1 sp. Nesokia, Orient. 



8 sp., Palaearct., 4 sp. Cricetomys, Eth., 1 sp. Malacomys, Eth., 3 sp. 

 Lophuromys, Eth., 4 sp. Saccosiomus, Eth., 3 sp. Acomys, Eth., 7 sp., 

 Palaearct. 3 sp. Arvicanthis, Eth. 9 sp., Palaearct. 2 sp. Dasymys, 

 Eth., 4 sp. Qolunda, Eth. 2 sp., Orient. 1 sp. Vandeleuria, Orient., 1 sp. 

 Chiropodomys, Orient., 3 sp. Batomys, Orient., 1 sp. Carpomys, Orient., 

 2 sp. Pogonomys, Aust., 8 sp. Hapalomys, Orient., 1 sp. Pithecocheirus, 

 Orient., 1 sp. Lenomys, Orient., 1 sp. Crateromys, Orient., 1 sp. Mal- 

 lomys. Orient., 1 sp. Craurothrix, Aust., 1 sp. Mastacomys, Aust., 1 sp. 

 Uromys, Aust., 8 sp. Conilurus, Aust., 16 sp. Megalomys, Neotrop., 1 

 sp. Sigmodon, Nearct., 7 sp. Oryzomys Neotrop. 60 sp., Nearct. 6 sp. 

 Chilomys, Neotrop., 1 sp. Reithrodotitomys, Neotrop. 3 sp., Nearct. 



9 sp. Eligmodontia, Neotrop. 6 sp. Nectomys, Neotrop., 7 sp. 

 Neotomys, Neotrop., 1 sp. Reithrodon, Neotrop., 5 sp. Phyllotis, Neo- 

 trop., 5 sp. Scapteromys. Neotrop., 2 sp. Ichthyomys, Neotrop., 4 sp. 

 Akodon, Neotrop., 40 sp. Mystromys, Eth., 1 sp. Brachytarsomys 

 Madagascar, 1 sp. Nesomys, Madagascar, 1 sp. Hallomys, Madagascar, 

 1 sp. Brachyuromys, Madagascar, 2 sp. Hypogeomys, Jladagascar, 

 1 sp. Gymnuromys, Madagascar, 1 sp. Eliurus, Madagascar, 4 sp. 

 Onychomys, Nearct., 8 sp. Pero)nyscus, Nearct., 30 sp. Rhipidomys, 

 Neotrop., 12 sp. Tylomys, Neotrop., 3 sp. Holochilus, Neotrop., 4 sp. 

 Oxymycterus, Neotrop., 8 sp. Blarinomys, Neotrop., 1 sp. Notiomys, 

 Neotrop., 1 sp. Neotoma, Neotrop. 1 sp., Nearct. 33 sp. Nelsonia, 

 Nearct., 1 sp. Xenomys, Nearct., 1 sp. Hodomys, Nearct., 1 sp 

 Phenacomys, Nearct., 6 sp. Evotomys, Nearct. 14 sp. Palaearct. 5 sp. 

 Synaptomys, Nearct., 7 sp. Dicrostonyx, Nearct. 1 sp., Palaearct. 1 sp. 

 Ellobius, Palaearct., 4 sp. 



Fam. 7. Spalacidae. Mole-hke forms, with very small sometimes 

 vestigial eyes and pinna, and short tail ; molars rooted, lophodont. Spalax 

 Giild., Palaearct., 8 sp. Rhizomys Gray, bamboo-rats. Orient., 5 sp. 

 Tachyoryctes Rupp. Ethiop., 3 sp. 



Fam. 8. Geomyidae. Pouched rats. Fossorial with large cheek 

 pouches opening on the cheeks outside the mouth, p \. Geomys Raf., 

 pocket-gopher, Nearct., 8 sp. Thomomys Max., Nearct., 1 sp. 



Fam. 9. Heteromyidae. Burrowing, with long hind limbs and tail ; 

 all confined to Nearctic except Heteromys. Dipodomys Gray, kangaroo- 

 rat, jerboa-hke, with 4 or 5 toes on pes, 12 sp. Perodipus Fitz., 10 sp, 

 Microdipodops Murr., 1 sp. Perognathus Wied., 38 sp. Heteromys Desm., 

 Nearct. 12 sp., Eth. 30 sp. 



Fam. 10. Bathyergidae. Subterranean, mole-like, with small eyes 

 and pimia, short legs and tail, hairs reduced, the upper incisors stand out 

 in front of the closed lips, premolars present or absent, all Ethiopian. 

 Batkyergus 111., Cape mole-rat, 1 sp. Oeorychus 111., 10 sp. Myoscalops 

 Thos., 3 sp. Heterocephalus Riipp, 2 sp., Somaliland, with nearly naked 



skin. 



Fam. 11. Dipodidae. Jerboas, terrestrial usually with 4 u. grinders, 

 rooted, lophodont ; infraorbital foramen large ; metatarsals greatly elon- 

 gated, often fused into a cannon bone, pes from 3 to 5 digits, all Palae- 

 arctic except Zapua. Sminthus Keys, and Bias. , 4 sp. Zapus Coues, Nearct. 

 6 sp., Palaearct. 1 sp. Dipus Gmel., 10 sp., pes 3-toed, metatarsals anky- 

 los- d, cervical vertebrae except atlas ankylosed ; leap and burrow. Alac- 

 taga F. Guv., 10 sp. Platycercomys Brandt., 1 sp. Euchoreuies W. Scl. 1 sp. 



